Get college assignment help at uniessay writers A harmonic wave is traveling along a rope. The oscillator that generates the wave com- pletes 49.0 vibrations in 28.4 s. A given crest of the wave travels 406 cm along the rope in a time period of 11.8 s. What is the wavelength?
At a grinding wheel has an angular velocity of 23.0 . It has a constant angular acceleration of 33.0 until a circuit breaker trips at time = 1.70 . From then on, it turns through an angle 440 as it coasts to a stop at constant angular acceleration.
A light, flexible cable is wrapped around a solid cylinder with mass 3.5 kg and radius 0.8 meters. The cylinder rotates on a frictionless pin. The free end of the cable is tied to a 4.0 kg box that is initially 2.9 meters above the floor. Determine the speed of the block just before it hits the floor if the block starts from at rest. (m/s)
A loudspeaker of mass 23.0 m is suspended a distance of h = 1.20 m below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 2.90 m.
highway safety enigeeners build soft barriers so taht cars hitting them will slow down at a safe rate. A person wearing a safety belt can withstand an acceleration of -3.0 x 100 m/s . how thick should barriers be to be safely stop a car that hits a barrier at 100 kn/h.
A rifle is aimed horizontally at a target 32 m away. The bullet hits the target 2.9 cm below the aiming point. Neglect air resistance. (a) What is the bullet’s time of flight? ? s (b) What is its muzzle velocity? ? m/s (in the bullet’s initial horizontal direction)
A steel ball rolls with constant velocity across a tabletop .950 m high. It rolls off and hits the ground .352 m from the edge of the table. How fast was the ball rolling?
20.17a What is the maximum emf output?
20.14c If you wanted to double the average induced emf by changing only the time, what would the new time interval be?
20.9a: Assuming that the wire has a resistance of 2.9ohm , over what period of time did the flux increase?
Get college assignment help at uniessay writers A 71.9 kg solid cylinder, 2.74 m long and with an end radius of 6.7 cm, stands on one end. How much pressure does it exert? The acceleration of gravity is 9.8 m/s2 . Answer in units of kPa.
A solid sphere rolls without slipping across a horizontal surface with an initial angular speed of 7.50 rad/s. The mass of the sphere is 5.38kg and its radius is 0.455m. The sphere then rolls up an incline. What is the height of the sphere above the horizontal surface when it comes to a stop?
An airplane starting from airport A flies 300 km east, then 355 km at 28.0° west of north, and then 150 km north to arrive finally at airport B. (a) The next day, another plane flies directly from A to B in a straight line. In what direction should the pilot travel in this direct flight? 1° north of east (b) How far will the pilot travel in the flight? Assume there is no wind during either flight. 2 km
A 57-kg skier is going down a slope oriented 36° above the horizontal. The area of each ski in contact with the snow is 0.13 m2. Determine the pressure that each ski exerts on the snow.
Some gliders are launched from the ground by means of a winch, which rapidly reels in a towing cable attached to the glider. What average power must the winch supply in order to accelerate a 184-kg ultralight glider from rest to 26.0 m/s over a horizontal distance of 48.0 m? Assume that friction and air resistance are negligible, and that the tension in the winch cable is constant.
Two horizontal forces, 239 N and 149 N, are exerted in opposite directions on a crate. What is the net horizontal force on the create?
A gun is fired and a 54 g bullet is accelerated to a muzzle speed of 120 m/s. If the length of the gun barrel is 0.60 m, what is the magnitude of the accelerating force? (Assume the acceleration to be constant.)
In order to simulate weightlessness for astronauts in training, they are flown in a vertical circle. If the passengers are to experience weightlessness, how fast should an airplane be moving at the top of a vertical circle with a radius of 1545 m?
Two horizontal forces, 220 N and 163 N, are exerted on a canoe. If the these forces are applied in the same directions, find the net horizontal force on the crate.
Waves moving on a lake have a speed of 2.2 m/s and a distance of 1.4 m between adjacent crests. (a) What is the frequency of the waves? (b) Find the period of the wave motion.
An archer shoots an arrow with a velocity of 45.0m/s at an angle of 50.0 degrees with the horizontal. An assistant standing on the level ground 150m downrange from the launch point throws an apple straight up with the minimum initial speed necessary to meet the path of the arrow.
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